Malicious PDF — malware analysis report

Static analysis result for SHA-256 817e41fb20f23a70…

MALICIOUS

PDF

70.7 KB Created: 2021-09-02 20:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba6a12d6eb494cf19407db4458c9373c SHA-1: 704ce0cfc72d85e86c22d084e83f7ec4a9571ba0 SHA-256: 817e41fb20f23a7047cd0171cbc4d013efb803d46ebeabd683940dca0f81878b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file is identified as a malicious PDF by multiple heuristics and ClamAV, indicating it's a phishing lure. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure, being image-heavy with minimal text and a click-outward action, further supports its use as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=mole+conversions+and+percent+composition+worksheet+answer+key PDF link annotation
    • https://toskov-yordanov.com/userfiles/file/siguboraliguxubelumimanif.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/fakavizow.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c1412d7465d39dab3c50d4deabf52f05/xitas.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/94596278994.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e99a464cf36d55955cffb69a222fe455/jadufadovuretejudubi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab93932916---vawagim.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/tonefakujegoxobenesos.pdfIn PDF document text
    • http://moretonassets.net/userfiles/roximobefeki.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/68593127435.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/49062512909.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9634c7445e2ab9e71ff72a5fff9da847/fikopujoxuteludeti.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7vo5qps88v4l2rt0cco32pca3o/doxajopiz.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198a3b9c33---nidiwogelagudaki.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/98616958705.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/86136646000.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7b7808d99118de252450859bb291bd3f/pibuleju.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/berev.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df976e6953---suwizuvugidavilug.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a305eb3b89f---tiron.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/53627040754.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/mimig.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/52998746018.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/sugamuzojemigemef.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/neorfhbvbh4cga36r0nnn92hi5/ninavaregatozu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EA 14320 bytes
SHA-256: 752eceffa4c3fe304dbcbbdb3d5c4e9bf6505d84764a83f219d499c0e677e221
font_01_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 11128 bytes
SHA-256: a8f2b6ddd1fd3749739474910bb8cee8fc58b57a3b723bab3476e9d909e63888
font_02_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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